debug kolla container image build

to see which sources are downloaded before docker build

Author: elelaysh

etc/kayobe/kolla.yml

@@ -23,6 +23,11 @@ kolla_source_version: "{{ stackhpc_kolla_source_version }}"
 # Path in which to generate kolla configuration.
 #kolla_build_config_path:
 
+# View debug logs, like source downloads, during image build.
+kolla_build_extra_config: |
+  [DEFAULT]
+  debug = True
+
 ###############################################################################
 # Kolla-ansible installation.